* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: all 0.3s ease;
}

body {
  font-family: "Roboto", sans-serif;
  display: flex;
  justify-content: center;
  background: var(--bg-page);
  color: var(--text-default);
  min-height: 100vh;
  padding: 20px;
}

.container {
  background: var(--bg-container);
  padding: 30px;
  margin: auto;
  border-radius: 20px;
  box-shadow: 0 10px 20px var(--shadow-container);
  width: 95%;
  max-width: 400px;
  text-align: center;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
}

.header h3 span {
  color: var(--accent-color);
  font-weight: 700;
}

.toggle-mode {
  border: none;
  background: transparent;
  font-size: 1.5rem;
  cursor: pointer;
}

.add-task {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.add-task input {
  flex: 1 1 200px;
  padding: 12px 14px;
  border: 2px solid var(--input-border);
  border-radius: 12px;
  background: var(--input-bg);
  color: var(--input-text);
  font-size: 1rem;
  outline: none;
}

.add-task input:focus {
  border-color: var(--accent-color);
}

.add-task input.error {
  border-color: #E74C3C;
}

.add-task .add-btn {
  padding: 12px 20px;
  border: none;
  border-radius: 12px;
  background: var(--add-btn-bg);
  color: var(--add-btn-text);
  cursor: pointer;
  font-weight: 500;
}

.task-list {
  list-style: none;
  text-align: left;
  margin: 20px 0;
}

.task.completed .task-text {
  text-decoration: line-through;
  color: var(--task-completed-text);
}

.task-text {
  color: var(--task-active-text);
}

.delete-btn {
  background: var(--delete-btn-bg);
  color: var(--delete-btn-text);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  padding: 5px 10px;
  font-weight: bold;
}

.delete-btn:hover {
  background: var(--delete-btn-hover-bg);
  color: var(--delete-btn-hover-text);
}

.filters {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0;
}

.filter-btn {
  padding: 10px 16px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: var(--filter-btn-inactive-bg);
  color: var(--filter-btn-inactive-text);
}

.filter-btn.active {
  background: var(--filter-btn-active-bg);
  color: var(--filter-btn-active-text);
}

.task-counter {
  text-align: right;
  color: var(--task-counter-text);
  font-size: 14px;
}

.task.dragging {
  opacity: 0.5;
  transform: scale(1.05);
}

.task.drag-over {
  background: rgba(93, 173, 226, 0.15);
  border: 2px dashed var(--accent-color);
}

.edit-input {
  flex: 1;
  padding: 8px 10px;
  font-size: 1rem;
  border: 2px solid var(--accent-color);
  border-radius: 8px;
}
/* Existing CSS remains the same, just add these animations */

.task {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  border-radius: 12px;
  margin-bottom: 12px;
  background: var(--bg-container);
  box-shadow: 0 4px 12px var(--shadow-container);
  transition: transform 0.3s, box-shadow 0.3s, background 0.3s, opacity 0.3s;
  opacity: 1;
}

.task.enter {
  opacity: 0;
  transform: translateY(-20px);
}

.task.leave {
  opacity: 0;
  transform: translateY(20px);
}


/* Theme variables */
:root {
  --bg-page: #f0f4f8;
  --bg-container: #ffffff;
  --text-default: #2c2c2c;
  --shadow-container: rgba(0,0,0,0.08);

  --input-border: #5DADE2;
  --input-bg: #ffffff;
  --input-text: #2c2c2c;
  --add-btn-bg: #5DADE2;
  --add-btn-text: #ffffff;

  --delete-btn-bg: #E74C3C;
  --delete-btn-text: #ffffff;
  --delete-btn-hover-bg: #f0f0f0;
  --delete-btn-hover-text: #E74C3C;

  --task-completed-text: #95A5A6;
  --task-active-text: #2c2c2c;

  --filter-btn-active-bg: #5DADE2;
  --filter-btn-active-text: #ffffff;
  --filter-btn-inactive-bg: #ecf0f1;
  --filter-btn-inactive-text: #2c2c2c;

  --accent-color: #F39C12;
  --task-counter-text: #333333;
}

.dark-mode {
  --bg-page: #121212;
  --bg-container: #1f1f1f;
  --text-default: #e0e0e0;
  --shadow-container: rgba(0,0,0,0.6);

  --input-border: #3498DB;
  --input-bg: #1f1f1f;
  --input-text: #e0e0e0;
  --add-btn-bg: #3498DB;
  --add-btn-text: #121212;

  --delete-btn-bg: #E57373;
  --delete-btn-text: #ffffff;
  --delete-btn-hover-bg: #2c2c2c;
  --delete-btn-hover-text: #E74C3C;

  --task-completed-text: #aaaaaa;
  --task-active-text: #ffffff;

  --filter-btn-active-bg: #3498DB;
  --filter-btn-active-text: #121212;
  --filter-btn-inactive-bg: #333333;
  --filter-btn-inactive-text: #e0e0e0;

  --accent-color: #F5B041;
  --task-counter-text: #e0e0e0;
}